1051 
The metabolism of the nitrogen corresponds thus in both cases 
with that of the carbon, namely a considerable accumulation at first, 
Gor Bieler 6 Be thas EN 
‘ ae 
J 
Jac latipes mere O gelet EA ES cake. 9, 
er a Warmer lraal ,o J&Z Laa. Oe ES. yi Cane WL 
Li wennen fer, e/% oe tne ALE: Comes PRI AG TLE hb he fa, 
9°% RE ne Gfk, Benzo . WU 
Kae Qukose 
IE PTE Vn 
{vlos 
ed 
x | Sess: 
a 
as | 
Ë 3 Mia tek Sees nc 
+ Aon omer 
Fig. I. Metabolism of the nitrogen; 50 em? tapwater in which dissolved ‘2 0/0 
glucose (free from water), 0,15°/) ammoniumnitrate, 0,1 °/, potassiumchloride, 0,0: 59/5 
erystallised fosforie acid, 0,1°/) magnesiumsulfate, 0,1 %/9 calciumnitrate (free fain 
water). Temp. 34° C. 
which decreases very much in the course of time, finally to remain 
nearly unchanged. 
Whereas carbonic acid is the form in which the carbon ean Jeave 
the organism, the experiments in table IL prove that the nitrogen is 
excreted as ammonium. The lowering of the nitrogennumber is 
parallel with a return of ammonium into the medium so that there 
is cause to consider, as before with the carbon, the course of the 
plastic aequivalent of the nitrogen and of the ammonium aequivalent 
in relation to time. 
The decrease of the plastic aequivalent of the nitrogen is combined 
with an increase of the ammonium aequivalent. This view may, 
however, give rise to error as to the ‘nitrogen, the ammonium being 
here a product of excretion, which Mikewise is mostly the form in 
which the nitrogen is given to the organism. By introducing the 
nitrogennumber this error is avoided. When excess of ammonium- 
nitrate is used it is chiefly the ammonium nitrogen which is assi- 
milated, as proved before. 7 
In a previous paper) was shown that manganese does not change 
1) These Proceedings, XV p. 753. 
